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It is shown that the amplitude for reflection of a Dirac particle witharbitrarily low momentum incident on a potential of finite range is -1 andhence the transmission coefficient T=0 in general. If however the potentialsupports a half-bound state at k=0 this result does not hold. In the case of anasymmetric potential the transmission coefficient T will be non-zero whilst fora symmetric potential T=1.Comment: 12 pages; revised to include additional references; to be published  in J Phys

Low momentum scattering in the Dirac equation